Orchard heater



w. c. szHEu` 1,996,977

ORCHARD HEAT'ER vApril 9, 193,5.

Filed June` 5 1929 2 Sheets-Sheet 1 lMIIEllIlllllllullllll'llllullllllll lll I? l.

ammira llhllllllllllllllllllllll A TTORNEY `April 9, 1935. W Q S'CHEU 1,996,977

ORCHARD HEATER' Filed June 5, 1929 2 Sheecs-Shee l 2 N ,VENTO/6 W////mi7 6156/260,

Patented Apr. 9, 1935 jfulv-li'el) STM-EsY wel?? ORCHARD HEATER y Y William C.'Scheu, Upland, Calif.,` assignorito4 ;Scheu Products Company, Ltd., Upland, Calif., f

la corporation of California Application June V5,1929, seriaiNc. :item79.l

' f 7 claims;v (o1.v 15s- 91) invention relates to orchard heaters yand particularly to. orchard heaters adapted tov utilize liquid fuel.V

The principal object of the invention is to proa` vide an orchard heater having-.novel and advantageous/means for effecting generation of vapors from the vliquid fuel.` A further objectoi the invention is to provide improved means for maintaining a uniform generating ame within a generating chamber partitioned koff from' the remainder of the fuel receptacle, and to permit passage of vapors generated both within and without said generating'chamber upwardly into the stack to furnish a supply of vaporized fuely for the .main combustion operation, Vwhich takes; place inside the stack.- A particular object of this invention'is to provide a generating chamber of such ,a character that the generating flame cany be maintained over a long period of time and in .spiteof gradual lowering. of the. fuel level due to consumption of the'fuel, Without requiring readjustment of the size of the exposed openings through which' air is admitted to support. said generating flame. j f I VA further object ofthe invention is to provide an orchard heater in which there is a minimum formation and deposition of carbon or soot" and in which such carbon. asy may be deposited' within the heater will be deposited' in such posi- 1 tion as to be readily removed withoutvreguiring dismantling of the entire heater.A

A further` object of the invention is to provide' for complete, or substantiallyoomplete, vaporization and combustion of liquid fuel placed in the L', fuel receptacle, so as toleave a minimum of unek burned residual matter.' Y

A further object of the invention is to provide improved means for igniting the fuel'within .the

fuel receptacle of the heater.v i

,A further object of the invention is to provide an orchard heater stack having improved means for admitting air thereto at pointsdistributed around the periphery .thereof and at a plurality of diierent levels, while excluding'directvr .access of rain or Wind to the interior of thestack.

TheA orchard heater of my present invention comprises, in general, a fuel receptacle, having a substantially tight fitting cover provided with means for admitting a regulated quantity of -air downwardly into the receptacle and with an outlet opening somewhat removed from saidair admitting` means, and partition means extending upwardly from the bottom of said receptacle and deiining an enclosed vaporizingvchamber directly l bencath said air admitting means, said partition means extending upwardly to somewhat i above.v thek maximum fuel level-in the 1 receptacle andbeing so constructed at its upper end as .to permit;

outflow oifyapors generated'theren'to said out-ji let opening inv the cover, and suitable provision being made for inflow of fuel from the remain-:ler

tion means shall bejso disposed as to substantially confineA the generating flame to .said chamber while permitting free passagey of the vapors gen-l erated therein upwardly to the outlet opening; in the cover. I

vThe heater also preferably includes a wick supe k port disposed within or adjacent the airfadrnitf ting means, wherebya piece ofsuitable wicking. material, saturated with gasoline or other vreadily inflammableliquid, maybe suspendedthereon and ignited, to start combustion as lhereinafter described.4 j y The orchard heater further includes a vstack mounted Von the cover with its lowerv end in cornmunication with the fuell receptacle, and thev preferredvform ofstackof the present invention .includes a lower cylindrical portion, `a second cylindrical portion spaced outwardly somewhat from the lower cylindrical portion andA extending both above and below the upper edge of said lower portion, andmcans disposedbetween saidV two cylindrical portions for maintaining the same in the relative positions aforesaid.andwfor4 admitting air through 'the annular spacebetween said-two portions and delivering such air ,to the interior of the stack at a plurality of different l angular positions around the stack and at a plurality of diiferentlevels. y ,j The accompanyingdrawings illustrate orchard heater constructions embodying my invention, and referringvthereto:

Fig. vl is a side elevation of "an orchard heaterr constructed in-"accordance with this inventionl Fig. 3T is'a sectionon line 3-43-in Fig."2.""

Fig. '4 is a horizontallsection of the stack Oniy line 4.-'.4 in Fig. 2. Fig. 5 is asection online'5'-5 inFi'g.' 4, showingthejmeans 'for'admitting air. to the stack.

y ing particularly theremovable n Fig. 6 is a section on line 6-6 inV Fig. 4.

Fig. 7 is a side elevation of the upper end of the stack, taken from the left side of Fig. 2, showhinge mounting of the stack cover. n c 'Y A The orchard heatershown in general in Figs. 1 and 2 comprises a fuel receptacle I provided with a substantially tight fitting cover 2 having acentraloutlet opening 3, and a stackfcomprisingY a lower section 4 secured Vto the cover around said outlet opening and an upper section 5 secured to said lower portion and providing a'combustion` space B in the interior thereof.

, TheV fuel receptacle is shown as comprising a bottom wall 8 and side wall 9, said side walls being advantageously formed in the shape of an inverted steep sided cone frustum having anoutwardly off-set portion IIJ nearl the upper end thereof and terminating in a vertical upper rim II. The cover 2 preferably slopes upwardly toward the outlet opening 3 which is'preferably located substantially centrally thereof, saidcover being shown as a flat frustum of acone and hav- Ving a depending flange I2 at yits outer'edge, making a substantially tight Lfltwith the rimY II of fthe 'receptacle but being preferably. removable therefrom. A shortcollar `.I3 is preferably secured tothe cover and extends upwardly therefrom around the 'opening.3,f so as to provide a convenient means for mounting the vstack Aon the cover to communicatewith said opening as hereinafter described. Y Y Y Means such as indicated at I5- are provided on cover 2 between the central opening 3 and the outer rim portion'of the cover for admittingV air cover near the side wall 9of'the fuel receptacle and at a position somewhat removed from the outlet opening 3. Said air-admitting andregulating means are shown as comprising a relatively large opening I6 in the cover for filling and 1gniting purposes, a capmember -I8 hingedly mounted on the cover I9 andV fitting around the edges of the opening I6, and a'plate 2| pivotally mounted as at 22 on said cap member. A plurality of relatively restricted openings V23V of smaller area than-opening I6 are provided in Vcap Vmember I8 and an arc shaped opening 24 in plate 2| is adapted to be moved into or out -oi positions of partial or totalalignmentf with' one or more of said openings 231 APlate 2I may be" Y provided with a handle 25 lfor rotation thereof to regulate the exposed area of theopenings' 23. f

A 'wick support 29, shownias comprising a small strip of metal bent upwardly atits projecting end,

as at 30, is-preferably securedto'th'e under side of cover 2 adjacent the inner edge `of Vopening I6Y and projecting partly across said opening for supf porting Ya piece of'wicking forigniting purposes,

as hereinafter describedr* Y n t VBeneath the filling and igniting opening I6 in the cover and Within'the fuelreceptacle Itprovide a vaporizing chamber`26,'separatedfrom the remainder of the fuel receptacleby. suitable Ypartition means 21. Said partition vmeans-may be of anysuitable form. For example, as shown'infFigs. 2 and 3, it may be formedasa wall 4enclosing chamber 26 ron all Vsidesand being Qfgeneral rectangular cross Ysection but, having -its outer wall 28 preferably curved to conformk substantially to f Y the curvature of the.' adjacentrside wall vof the fuel receptacle. Said partition is'fshownin the above mentioned iiguresxas comprising an'inner wall 21a and side walls 2117,` .in addition to the wall 28 aforesaid, and the walls 21a and 28 are shown as inclined somewhat and having substantially the same inclination as the adjacent side wall 9 of the fuel receptacle, while the side walls 21h are substantially vertical, so that the cross section of vaporizing chamber 26 is substantially the same throughout its height. However, the wall 21a may, if desired, diverge downwardly from the vwall 28, so as to provide a vaporizing chamber of downwardly increasing cross section, and thus gradually` increase the areaof the exposed fuel surface within the vaporizing chamber as the fuel level is lowered.V Also, if desired, the wall 21a may be made to converge downwardly toward the wall 28,-

Vso as to provide a vaporizing chamber of downwardly decreasing cross section. Furthermore, the

partition means may, if desired, be of substantially circular or other suitable cross section instead of rectangulanfwith its outer edge preferably extending closely adjacent a portion of the side wall 9 of the fuel receptacle.

,The upper edge of the inner wall of the partition meansV 21 is disposed beneath a rportionY ,of

posed wholly above the portionof the interior` of the fuel receptacle which lies'outside the partition means, soy that vaporsfrom the vaporizing chamber cannot passdirectly upward into the stack, but must first pass Yinwardly beneath the Fig.' 2, the. upper edgejof partition'21 is shown` as being substantiallyY horinontalV and substantially in contact with the cover 2 at its outer edge, as shown at 3|, so thatdue to the inclination of `cover 2 lying between the Vopening, I6 andthecen- Y.

trai opening 3, and said central opening isA dis 25 said cover a space 32 is provided between the upper edges of walls 21a and 21band saidcover for outflow of vapors from generating chamber 26; If desired, either the side walls 21b or the inner wall 21a may be provided with openings or notches extending downwardly from their upper edges, to permit overflow of liquid fuel from the generating chamber26 into the remainder of the fuel receptacle during filling, when such fuel is poured in through opening I6 after the regulating device I5 has been swung back upon its hinge I9, and thus .facilitate filling of the receptacle with fuel. Said openings or notches'at the upper edge of the partition means 21 may also be so located as to control the distribution4 of flow of the vapors from the generating chamber into the remaining portion of the fuel receptacle. 'I'he exact location ofv said openings may be determined in any case to give the desired operation, but it is ingeneral desirable that any such openings in the partition 21` be located at or near the upper edge thereof, Vso that outiiow of vapors from the generating .chamberV cantake place only at or near the upper end thereof. i

VThe partition 21 may rest upon thebottom wall 8 of the fuel receptacle, and in such case Iprefer` to provide openings inthe lower portion'of said partition for permitting flow of vfuel from outsideA said partition into the generating chamber'withinsaid partition.` Y Such fuel inflow openings are furthermorel'preferably of such size and located in such position asto prevent or minimize Voutflow of vapors therefrom, even though the fuel level should fall below the top of said openings.

For this purpose saidk openingsr may advanta-k outwardly and upwardly, with'sad neck portion' geously be located in the outer portion of ther partition, that is, the portion adjacent the side wall 9 of the` fuel receptacle.: For example,eas shown in Figs; l2 .and 3,-'the fuel inflow jopenings 31 are shown as formed in-the outer wallf28, and since said outer wall is in fairly close proxirnitytoth'el side wall of theifuel receptacle, it is 'evident.-.that but little if any outflow of vapors can takeplace through said openin'gseventhough the'fuel level falls below the top of thegopenings. However, since the wall 28 is notheld in tight engagement with the sidewall .9, sufficient space is left there-l betweenV for gradual. inflow of fuel through saidA openings to replace the fuel vapori'zed or .con-

sumed within the vaporizing chamber. i In case av partition of cylindrical or other non-rectangular cross-section is employed, the fuel inow open-V ings are alsopreferably formedrin the portion of said partition which is closely adjacent theside wall 9 so as to substantially or'wholly prevent outflow of vapors therethrough. Furthermore, in any case the fuel inflow openings, preferably extend upwardly to only "a sufiicient height to insure drainage of iuelfrom the entire'receptacle into the vaporizing chamber in spite of any depo' fuel on 'the sition of unburned residue from the bottom of the fuel receptacle; y f

Any suitable means may be provided for hold- Ving the lpartition means in the proper position be provided by cutting out and bending down a' portion of the outer wall 28 vto form an earL 38 having an opening loosely engaging over a lug 4| secured to and extending Aupwardly from the olf-` set portionA I0 of the side wall Vso as to permit relative tilting of the partition 21 about a horizontal axis extending perpendicular to an imaginary line drawn from stud 4I to the center of the fuel receptacle. The bending down of the ear 38 also leaves an opening 42 in the upper portion of wall 2B, which also permits overflow of fuel from the vaporizing chamber during filling as above described. f Y i Y Instead of resting the partition means of any of the forms above described on the bottom of the fuel receptacle, Irmay terminate the same somewhat above the bottom and lsupport 'said partition in some other manner, as, for example,

by means of the ear'3l and lug 4 Is above described. In this case the space beneaththe lower edge of partition 21 may suffice in general to permitfthe necessary flow of fuel into the vaporizing chamber, but, if desired, additional fuel inflowopening means may be provided corresponding to the opening means 31 above described and serving to insure proper drainage of fuel into the vaporizing chamber in spite of accumulation of residual matter in the lower portion thereof. K

The lower member 4 of the stack is shown as comprising a neck portion 58 adapted to engage the collar I3 so as to normally hold the stack in position of communication with the outlet opening 3 of the cover but to permit removal of the stack when desired. For this purpose the collar I3 and neck portionV 55 may be ninadatto taper inwardly and upwardly, with: said neck portionv ttingaround said collar, as'shown in Fig. v1,' or saidcollar and neck' portion may be made to nare tting within said collar.` `Inl either case, the weight ofthe stack will hold ,said *neckv portion down in tightengagement with said;collar,. and

maintain a substantially air-tight and vapor-tight t atthis point; Above said neck portion Vthev stack` member 4 extends outwardly as shown at 59, saidoutwardly extending portion 59 being,

if desired, inclined upwardly somewhat toward itsouter edge.` Said outwardly extending,V portion 59-is preferably provided with Vaplurality, of air inlety openings, such asslots `6l) extending radially'or in any other suitable manner and disposed atsuitable intervals aroundtthe same, and it will be seen that said openings, beingin the substantially horizontalor slightly'sloping bottom portion 59, are well protected against access of rain 'or wind therethrough. .The .lower stack member 4 further comprises a substantially cylindrical portion 6I extending upwardly fromk they outer edgevof portionl 59.

The upper stack member 5 comprises asubstantially cylindrical portion 62 and a'frusto-conical portion 63 extending upwardlyfrom said cylindrical. portion and having anopening 64at its upper end. kThe cylindrical portion 62 of said upper stack member is of somewhat greater inside diameter thanJthe outside ofthe cylindrical portion 6i of the lower stack mem-beniand suitable means are .provided for supporting theupper stackmemberin position vwith the lower edge 66 of the cylindrical .portion thereof extending somewhat below the upper edge' 51 of the lower stackV member and for permittingvv entranceof air between 'the overlapping portions of said stack members, so that the upper stack member overhangs and surrounds thelower stack member and thus prevents direct access of rain or wind therebetween.` f

The means for vsupporting the upper stack member maycomprise a corrugatedA supporting and air distributing'ring v69 whose corrugations extend vertically and comprise alternately arranged inwardly oil'set `portions 10 and outwardly offsetV portions 1l. 'The--total overall thickness of ring 89, from the inner face of portions 10 to the outer face of portions 1| is substantially equal to Vthe distance between the` cylindrical portions 6| and '62 of the two stack members.v Said ring is placed vwith its lower edge somewhat below the upper edge Blof the lower y-staclrmember and its upper edge somewhat above said'upper edge of the lower stack member, and the inwardly offset y portions 1B thereof may be secured to cylindrical portion 6i as by means of yrivets 12, while "the outwardly offset portions 1| may be provided with outward projections or bumps 13, the cylindrical portion 62 fitting slidably around the upper pore tions of said outwardly offset portions and rest-A 1 ing kupon said outward projections or bumps'.y It will be seen that the upper stack member is thus normally held in proper position with respect 'to the lower stack member, but may be readily removed therefrom when desired. The corruga-l tions of ring 69 serve to provide alternately disposedV air inlet passages Hand 15, the passages 14r being provided between the cylindrical portion 6| of the lowerrstack member and the outwardly offset portions 1i, and thepassages 15 being provided between the cylindrical portion 62y of the upper stackmember and the; inwardly offset portions 10. Furthermoreth'eair entering through inlet passage 14 is delivered to the in# indicated by the arro'wfat 16 inv Fig'. 6, while fthe air entering 'through inlet passages `15 is deliv-` ered to the interior of the'stack at substantially Vthe level of the upper edge of the corrugated ring 69,V as indicated bythe arrow 'atl Tl in Fig;Y 5, so, that the above described :o'nstruction provides for delivery of air `totlieinteriorof the stack-atV a pluralityof separate points, and'in a plurality 'n of separateV jets or streams,.at different angular positions around the stack and at dierent ele-- vations therein. f

A cap or cover 8071s providedfor Vclosingthe opening 64at the.jupper endof the stack,- saidv cover being provided with a depending flange `8I vat its outer: edge fitting fairly closely around the upper part of thes'stack. Said stack cover is supported by means ofA a hinge 82,.so `as to permit it to be swungeither to open position as shown in Fig. 2 or .to closed'position'as` shown in Fig. l.

YWhen said cover is in closed position the depending flange 8l would ordinarily prevent it from being swung about said hinge due to engagement thereof with the upper end'ofA the stack, and I therefore prefer 'to mount thehinge 82 in such mannerfas to'permit upward movement thereofsufficiently to bring thelower edge of flange 8| above the top of the stack or insuch positionas to swing clear of the' same about said hinge. .For this purpose the hinge`82 maybe mounted at the upper-end of a bar 83which is adaptedy to slide Y' vertically in 4suitable guidefmeans such-as'strap 84 securedltothe Yside wall of thestaclc.VV lA stopv member 85 `is mounted on.thebar-.83 below the guidemember 84 `andvis adapted to engage said 4guide Vmember so as Vto'limit the normal .upward cover 8B is lin vclosed position an upward pull of sufiicient strengththereon will release the above described holding means and will rst move the` stack cover, togetherl with hingel 82 and b ar 83- Vupwardly Yuntil theA cover is free ,to swing,- and will vthereafter swing thel cover back 'about its hinge to. open position. u'Ihe stop Amember 85 normally prevents; completeremoval of bar '83 from guide means 84 during the above described operation of opening the cover, but kin order to 'Y permit completeremoval of the cover when desired,A saidy stop member is preferably pivotally connected `to bar 83, as shown atv88, `so as topermitit to be swung'into, linewith said bar, whereupon the bar, together withnsaid stop member,

'may `bevvvithclrawn upwardly throughsaid guide-V means. .l In` the operation of the above described heater,

the fuel receptacle` l, including the spaceinside andV outside the vaporizing chamber 26,'is first filled with oil -or other liquid fuel up to the de-f' sired level, for example some suchievel as indi`r cated bythe dotted'line at 90 inFig. 2, such fuel being poured in through openingllas'above described` and iiowing from the vaporizing cham- Y ber into the `remainder of the fuel .receptacle through the opening means suchvas 31 adjacent the lower ,end of the; partition means. Also, it is desired to -fill thereeptaclemore .rapidlythan is permitted by the flow through, said openings,` the fuelmay be poured-in ata faster rate so as to i'lrst fill the vaporizing chamber to thev Vlevel of the uppervedgeY thereof or of the open- 'ing 42 adjacent suchupperedgeand then o ver without any further readjustment now into the `space outside. the partition means.l`

In starting theheate'rin operation apiece ofwicking material, such as v`cloth or asbestos fabric may advantageously be placed over the wick sup.- port so as to Vdepend'therefrox belowopening l6,as shown at-'95 in Fig.,2, and a small amount of easily inammableliquid such as gasoline is preferablyfpoured through openingflqonto saidv wicking so as-tosaturate the same,` and also, if` desired, 4vonto the surfaceof the foil inthe vaporizing chamber and is ignited in any suitable man' ner as by means oi.' v a lighted torch inserted" through said opening. :If/desired, of course, they wicking may first besaturated Ywiththe gasoline oryother ignitingiliquid, arid then placed in the position shown and ignited. The wicking, beingV supportedout `of lcontact withfthewalls of thevaporizing chambeiyeis allowed to burn freely,L

desiredarea of, openings-23.forradmitting air I during the initial period of the operation.' f The heat produced by combustion of the f ignitingV liquid withinthe vaporizing.y chamber causes vaporizationf a vportion of such liquidand alsoof the more volatile portions of the fuel oil, andthe vapors thus generated pass kupwardly in the'vaporizingchamber and from the upper end there'- of, either over the top or through the open-ingmeans adjacentf the upper edge, and thence through theupper part oftheful receptacle and beneath cover 2 to the outlet.opening3,and up into the stack.v For starting combustion of these vapors in the stack,v a'small amount of gasoline or ,other readily inflammable liquid maybepoured 2 on the inside'of the walls of the stackV and ignited concurrently with the ignitionfinthe vaporizing chamber. The vaporsentering.: the stack vrwill, thereupon be also ignited and burn in thepresence of air admittedrthrough the several opening means in the stack. .As soon as the Vaporizing chamber and the fuel therein is heated vsufficiently toV causey a continual generation of vapors from such fuel, these vapors will furnish the fuel'for the generating ame; a certain proportion of such vapors burningin thepresenceof air justthe opening 24 so asto decrease; the exposed Y tov heat the oilA4 in- Ythe f-vaporizing ,chamber A`not only by direct impingementof thehot'flame or combustion products on the surface of the oil and by radiation from the flame to the oil,` but; also by Yheat conducted to the oil through the heated. walls of the vaporizing i chamber.4 After thisnrst readjustment, very little regumtion is' required, and I have foundY that itis possiblev to obtainsubstantially completeY vaporization'and combustion of alljof the f-uel Iwithin the receptacle of the air admitting openings. i

It is evident thatv theyaporization of the fuel.l during operationof the heater, will take place;

principally within the' vaporizing .chamber inside the -partition means,'but the opening means adA jacent the lovnerfedge` of said partition means,"

such as the., openings .31', or, the, space beneath the lower edge of the partition means, permits a gradual inflow of fuel from the part of the fuel receptacle outside the partition means into said vaporizing chamber, so that substantially all of the fuel within said receptacle, with the exception of that portion vaporized outside the partition means, is eventually permitted to ow into the vaporizing chamber and be vaporized therein. Due to the fact that the greater portion of the vaporization of the fuel occurs within the vaporizlng chamber, there will in general be a greater accumulation of residual unvolatilized material or ashes accumulating on the bottom of the fuel receptacle within said vaporizing chamber than outside the partition means, and it may, therefore, be desirable from time to time to remove such residual matter therefrom. This may be accomplished without removing the cover from the fuel receptacle, by simply tilting said receptacle to a position so as to raise the side of the receptacle at which the vaporizing chamber is located and thus permit such residualy matter to be removed by gravity from the bottom of the vaporizing chamber to other portions of the fuel receptacle. It will also bey seen that the pivotal mounting of the partition means adjacent its upper edge will permit said partition means to swing clear of the bottom of the receptacle when said receptacle is tilted in this manner, thus permitting free movement of the residual matter along the bottom of the receptacle and out of the vaporizing chamber.

It will be understood that before starting the heater in operation, the stack cover 80 is swung to open position as above described and as shown in Fig. 2, so as to permit free exit of the flame and hot. products of combustion through the opening 64 at the upperV end of the stack.` When the heater is not in use, however, said cover may be moved to closed position.

I claim:

l. An orchard heater comprising a fuel receptacle having a cover provided with means for admitting a regulated quantity of air downwardly into the receptacle and with an outlet opening somewhat removed from said air admitting means, partition means extending upwardly from 'the bottom of said receptacle and dening an enclosed vaporizing chamber directly beneath said air admitting means, said partition meansbeing so formed and disposed as to permit outflow of vapors from only the upper portion of said Vaporizing chamber into the space outside the partition means and to permit inflow of liquid fuel from said space outside the partition means into only the lower portion of said vaporizing chamber, and means pivotally supportingY said partition means adjacent the upper end thereofupon said fuel receptacle, so as to permit said partition means to swing clear of the bottom of the receptacle when said receptacle is tilted.

2. A stack for orchard heaters comprising a lower member having a vapor inlet opening at its lower end, an upper member having its lower portion surrounding and spaced from the upper portion of said lower member and overlapping the same, and a corrugated ring disposed between the overlapping portions of said upper and lower members, the corrugations of said ring providing passages for admission of air rbetween said overlapping portions into the interior of the stack.

3. A stack for orchard heaters comprising a .lower member having means for admission of vapors to the lower end thereof, an air distributing ring secured to said lower member and having vertical corrugations extending above and below the upper edge of said lower member, and an upper member mounted upon andaround said air distributing member providing passages for admission of air to the interior of the stack.

4. A stack for orchard heaters comprising a lower member and an upper member having their respective upper and lower portions overlapping and with the lower portion of the upper member surrounding and spaced from the upper portion of the lower member, an air distributing ring disposed between the overlapping portions of said upper and lower members and having vertical corrugations enclosing alternate inwardly and outwardly offset wall portions and defining passages for admission of air to the interior of the stack, means securing the inwardly offset portions of said ring to the lower stack member and means on the outwardly offset portions of said ring for supporting the upper stack member.

5. An orchard heater comprising a fuel receptacle having bottom and side walls and provided with a cover, partition means extending upward- 1y within said receptacle and defining an enclosed vaporizing chamber inside said partition means and separate from the remainder of the fuel receptacle, detachably interengaging means on said partition means and on the side wall of said fuel receptacle for removably supporting and positioning said partition means within said receptacle on said side Wall thereof independent of said cover, said partition means being so formed and vpositioned as to permit outflow of vapors formed within said vaporizing chamber from only the upper portion thereof while permitting inflow of liquid fuel from outside said partition means into the lower portion of said vaporizing chamber, means for admitting a. regulated quantity of air downwardly into said vaporizing chamber, wholly at one side of said partition means, and an opening in the cover for permitting outflow of vapors from said fuel receptacle, said opening in the cover lying wholly at the opposite side of said partition means from said air admitting means.

6. An orchard heater as set forth in claim 5,

ceptacle defining a vaporizing chamber directly below said air admitting opening, and a wick support secured to said cover and projecting from an edge of said air admitting opening partly across said opening in a position substantially vertically abovethe central portion of said vaporizing chamber so as to support a piece of wickV material saturated with igniting liquid in position adjacent said opening completely out of contact with all portions of the Walls of said vaporizing chamber.

' WILLIAM C. SCIlZlilU.Y 

